These are estimates found by counting accounts in shadowbot with between 10 - 15sp the standard delgation amount from free steem accounts and are not approximates, if someone who has a subscription to STEEMSQL would be easy to find totals

here are a select few i choose at random to show steem delegation

https://steemit.com/@carlguz/transfers

https://steemit.com/@orangejuicee/transfers

https://steemit.com/@adam-boyling

https://steemit.com/@hadilhk

I used https://www.tools4noobs.com/online_tools/count_lines/ to count users